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- Question
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
Options- A. filtration
- B. digestion
- C. sedimentation
- D. both (b) and (c)
- Correct Answer
- both (b) and (c)
- 1. __________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
Options- A. Calcium
- B. Fluorine
- C. Phosphorous
- D. Sulphur Discuss
- 2. Sulphur dioxide present in the industrial chimney exhaust gases causes
Options- A. respiratory & lung disease.
- B. reduction in plant's productivity owing to acid rain.
- C. corrosion of building materials.
- D. all (a), (b) and (c). Discuss
- 3. Hydrogen ion concentration in distilled water is
Options- A. 10-7
- B. 7 x 10-7
- C. 107
- D. 7 x 107 Discuss
- 4. Noise level inside a jet air liner in normal flight is about __________ decibels.
Options- A. 80
- B. 100
- C. 125
- D. 145 Discuss
- 5. TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
Options- A. 5
- B. 100
- C. 1000
- D. 2000 Discuss
- 6. __________ is the process of killing organism in water.
Options- A. Coagulation
- B. Sterilisation
- C. Disinfection
- D. Sedimentation Discuss
- 7. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (? g)/litre.
Options- A. 2
- B. 42
- C. 332
- D. 1050 Discuss
- 8. The maximum CO2 is emitted into the atmosphere by
Options- A. combustion
- B. urea
- C. biomass burning
- D. trees Discuss
- 9. Pick out the wrong statement.
Options- A. A slight haze at the top of chimney indicates good combustion in the furnace.
- B. A bag filter incurs very small pressure drop and is very efficient for removal of sub-micronic dust particles from flue gases at very high temperature.
- C. Electrostatic precipitator is the most efficient dust collection equipment for removal of sub-micronic dust particles present in flue gas.
- D. none of these. Discuss
- 10. Brown spots in fabrics will be caused by washing with water containing large amount of .
Options- A. iron
- B. zinc
- C. iodine
- D. bromine Discuss
Environmental Engineering problems
Search Results
Correct Answer: Fluorine
Correct Answer: all (a), (b) and (c).
Correct Answer: 10-7
Correct Answer: 100
Correct Answer: 5
Correct Answer: Disinfection
Correct Answer: 42
Correct Answer: combustion
Correct Answer: A bag filter incurs very small pressure drop and is very efficient for removal of sub-micronic dust particles from flue gases at very high temperature.
Correct Answer: iron
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